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Electro-osmotic flow in hydrophobic nanochannels

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Abstract

Hydrophobic surfaces with large slip lengths have the potential to enhance electro-osmotic flows. Existing theories of electroosmosis in hydrophobic channels postulate immobile surface charges and/or make a number of simplifying assumptions by considering mostly weakly charged surfaces and thin diffuse layers compared to channel dimension. In this paper, we extend prior models by focusing on planar and cylindrical nanochannels. Our theory accounts for a hydrodynamic slip and a mobility of surface charges, and is valid not only on the scale of the nanochannel with thin diffuse layers, but also on the scale of the overlapping diffuse layer. The model is simple enough to allow us to derive analytical approximations for the electro-osmotic velocities even when the surface potential and charge density are quite large. We also present numerical solutions to validate the analysis and illustrate the variation of electro-osmotic velocities in response to changes in the channel size, potential, surface charge and its mobility, hydrodynamic slip length, and salt concentration. Our results are directly relevant for carbon nanotubes, graphene nanochannels, and conventional nanoporous membranes.

Graphical abstract: Electro-osmotic flow in hydrophobic nanochannels

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Publication details

The article was received on 31 Jul 2019, accepted on 20 Sep 2019 and first published on 20 Sep 2019


Article type: Paper
DOI: 10.1039/C9CP04259H
Phys. Chem. Chem. Phys., 2019, Advance Article

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    Electro-osmotic flow in hydrophobic nanochannels

    E. F. Silkina, E. S. Asmolov and O. I. Vinogradova, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP04259H

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